提交 558540c1 编写于 作者: J Jan Schmidt

btrfs scrub: print paths of corrupted files

While scrubbing, we may encounter various errors. Previously, a logical
address was printed to the log only. Now, all paths belonging to that
address are resolved and printed separately. That should work for hardlinks
as well as reflinks.
Signed-off-by: NJan Schmidt <list.btrfs@jan-o-sch.net>
上级 13db62b7
......@@ -17,10 +17,12 @@
*/
#include <linux/blkdev.h>
#include <linux/ratelimit.h>
#include "ctree.h"
#include "volumes.h"
#include "disk-io.h"
#include "ordered-data.h"
#include "backref.h"
/*
* This is only the first step towards a full-features scrub. It reads all
......@@ -100,6 +102,19 @@ struct scrub_dev {
spinlock_t stat_lock;
};
struct scrub_warning {
struct btrfs_path *path;
u64 extent_item_size;
char *scratch_buf;
char *msg_buf;
const char *errstr;
sector_t sector;
u64 logical;
struct btrfs_device *dev;
int msg_bufsize;
int scratch_bufsize;
};
static void scrub_free_csums(struct scrub_dev *sdev)
{
while (!list_empty(&sdev->csum_list)) {
......@@ -195,6 +210,143 @@ struct scrub_dev *scrub_setup_dev(struct btrfs_device *dev)
return ERR_PTR(-ENOMEM);
}
static int scrub_print_warning_inode(u64 inum, u64 offset, u64 root, void *ctx)
{
u64 isize;
u32 nlink;
int ret;
int i;
struct extent_buffer *eb;
struct btrfs_inode_item *inode_item;
struct scrub_warning *swarn = ctx;
struct btrfs_fs_info *fs_info = swarn->dev->dev_root->fs_info;
struct inode_fs_paths *ipath = NULL;
struct btrfs_root *local_root;
struct btrfs_key root_key;
root_key.objectid = root;
root_key.type = BTRFS_ROOT_ITEM_KEY;
root_key.offset = (u64)-1;
local_root = btrfs_read_fs_root_no_name(fs_info, &root_key);
if (IS_ERR(local_root)) {
ret = PTR_ERR(local_root);
goto err;
}
ret = inode_item_info(inum, 0, local_root, swarn->path);
if (ret) {
btrfs_release_path(swarn->path);
goto err;
}
eb = swarn->path->nodes[0];
inode_item = btrfs_item_ptr(eb, swarn->path->slots[0],
struct btrfs_inode_item);
isize = btrfs_inode_size(eb, inode_item);
nlink = btrfs_inode_nlink(eb, inode_item);
btrfs_release_path(swarn->path);
ipath = init_ipath(4096, local_root, swarn->path);
ret = paths_from_inode(inum, ipath);
if (ret < 0)
goto err;
/*
* we deliberately ignore the bit ipath might have been too small to
* hold all of the paths here
*/
for (i = 0; i < ipath->fspath->elem_cnt; ++i)
printk(KERN_WARNING "btrfs: %s at logical %llu on dev "
"%s, sector %llu, root %llu, inode %llu, offset %llu, "
"length %llu, links %u (path: %s)\n", swarn->errstr,
swarn->logical, swarn->dev->name,
(unsigned long long)swarn->sector, root, inum, offset,
min(isize - offset, (u64)PAGE_SIZE), nlink,
ipath->fspath->str[i]);
free_ipath(ipath);
return 0;
err:
printk(KERN_WARNING "btrfs: %s at logical %llu on dev "
"%s, sector %llu, root %llu, inode %llu, offset %llu: path "
"resolving failed with ret=%d\n", swarn->errstr,
swarn->logical, swarn->dev->name,
(unsigned long long)swarn->sector, root, inum, offset, ret);
free_ipath(ipath);
return 0;
}
static void scrub_print_warning(const char *errstr, struct scrub_bio *sbio,
int ix)
{
struct btrfs_device *dev = sbio->sdev->dev;
struct btrfs_fs_info *fs_info = dev->dev_root->fs_info;
struct btrfs_path *path;
struct btrfs_key found_key;
struct extent_buffer *eb;
struct btrfs_extent_item *ei;
struct scrub_warning swarn;
u32 item_size;
int ret;
u64 ref_root;
u8 ref_level;
unsigned long ptr = 0;
const int bufsize = 4096;
u64 extent_offset;
path = btrfs_alloc_path();
swarn.scratch_buf = kmalloc(bufsize, GFP_NOFS);
swarn.msg_buf = kmalloc(bufsize, GFP_NOFS);
swarn.sector = (sbio->physical + ix * PAGE_SIZE) >> 9;
swarn.logical = sbio->logical + ix * PAGE_SIZE;
swarn.errstr = errstr;
swarn.dev = dev;
swarn.msg_bufsize = bufsize;
swarn.scratch_bufsize = bufsize;
if (!path || !swarn.scratch_buf || !swarn.msg_buf)
goto out;
ret = extent_from_logical(fs_info, swarn.logical, path, &found_key);
if (ret < 0)
goto out;
extent_offset = swarn.logical - found_key.objectid;
swarn.extent_item_size = found_key.offset;
eb = path->nodes[0];
ei = btrfs_item_ptr(eb, path->slots[0], struct btrfs_extent_item);
item_size = btrfs_item_size_nr(eb, path->slots[0]);
if (ret & BTRFS_EXTENT_FLAG_TREE_BLOCK) {
do {
ret = tree_backref_for_extent(&ptr, eb, ei, item_size,
&ref_root, &ref_level);
printk(KERN_WARNING "%s at logical %llu on dev %s, "
"sector %llu: metadata %s (level %d) in tree "
"%llu\n", errstr, swarn.logical, dev->name,
(unsigned long long)swarn.sector,
ref_level ? "node" : "leaf",
ret < 0 ? -1 : ref_level,
ret < 0 ? -1 : ref_root);
} while (ret != 1);
} else {
swarn.path = path;
iterate_extent_inodes(fs_info, path, found_key.objectid,
extent_offset,
scrub_print_warning_inode, &swarn);
}
out:
btrfs_free_path(path);
kfree(swarn.scratch_buf);
kfree(swarn.msg_buf);
}
/*
* scrub_recheck_error gets called when either verification of the page
* failed or the bio failed to read, e.g. with EIO. In the latter case,
......@@ -205,6 +357,8 @@ static int scrub_recheck_error(struct scrub_bio *sbio, int ix)
{
struct scrub_dev *sdev = sbio->sdev;
u64 sector = (sbio->physical + ix * PAGE_SIZE) >> 9;
static DEFINE_RATELIMIT_STATE(_rs, DEFAULT_RATELIMIT_INTERVAL,
DEFAULT_RATELIMIT_BURST);
if (sbio->err) {
if (scrub_fixup_io(READ, sbio->sdev->dev->bdev, sector,
......@@ -212,6 +366,11 @@ static int scrub_recheck_error(struct scrub_bio *sbio, int ix)
if (scrub_fixup_check(sbio, ix) == 0)
return 0;
}
if (__ratelimit(&_rs))
scrub_print_warning("i/o error", sbio, ix);
} else {
if (__ratelimit(&_rs))
scrub_print_warning("checksum error", sbio, ix);
}
spin_lock(&sdev->stat_lock);
......@@ -326,9 +485,8 @@ static void scrub_fixup(struct scrub_bio *sbio, int ix)
++sdev->stat.corrected_errors;
spin_unlock(&sdev->stat_lock);
if (printk_ratelimit())
printk(KERN_ERR "btrfs: fixed up at %llu\n",
(unsigned long long)logical);
printk_ratelimited(KERN_ERR "btrfs: fixed up error at logical %llu\n",
(unsigned long long)logical);
return;
uncorrectable:
......@@ -337,9 +495,8 @@ static void scrub_fixup(struct scrub_bio *sbio, int ix)
++sdev->stat.uncorrectable_errors;
spin_unlock(&sdev->stat_lock);
if (printk_ratelimit())
printk(KERN_ERR "btrfs: unable to fixup at %llu\n",
(unsigned long long)logical);
printk_ratelimited(KERN_ERR "btrfs: unable to fixup (regular) error at "
"logical %llu\n", (unsigned long long)logical);
}
static int scrub_fixup_io(int rw, struct block_device *bdev, sector_t sector,
......
Markdown is supported
0% .
You are about to add 0 people to the discussion. Proceed with caution.
先完成此消息的编辑!
想要评论请 注册